Telecommunication system



'Oct ll, 1949'.

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G. DEAKIN.

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TELECQMMUNICATION SYSTEM Filed Feb. s, 1944 1s sheets-sheet -12 AGE/VT Oct. 11, 1949. G. DEAKIN 2,484,080

TELECOMMUNICATION SYSTEM Filed Feb. 5, 1944 1e sheets-sheet 1s 18 Sheets-Sheet 14 G. DEAKIN TELECOMMUNICATION SYSTEM Oct. 1l, 1949.

Filed Feb. 5, 1944 Oct. 11, 1949. Q DEAKIN 2,484,080

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TELECOMMUNICATION SYSTEM Filed Feb. 5, 1944 18 sheets-sheet 17 AGENT oct. 11, 1949. DEAKIN 2,484,080

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A/ MA//JJ/v/urw GER/QLD DEH/WN Patented Oct. 11, 1949 2,484,080 TELECOMMUNICATION SYSTEM Gerald lDeakin,

NewYork, N. Y., assignor-to International Standard Electric Corporation, New

York, N. Y., a

corporation of Delaware Application February 5, 1944, Serial No. 521,160 19 Claims. (Cl. 179'-18) This invention relatesA tonew and useful improvements in automatic telephone systems.

The objectof the invention is to simplify. the

circuits of automatic.telephonerswitches which.y

are used in the-establishment-of connections and to `make .theswitchingarrangement more flexible.-

and more readily adapted for the requirements of inter-cnice and intra-office -connections thanA was heretofore practicable.

According to one--ofvthe-features of the. invention all the numerical-and.y non-numerical switches through which the-'calling and called subscribers are-connected, are identical. Preferably, eachswitch has only va set of-wipers and a bankcil terminalsandthe cooperation of `the switch is controlled bya magnet and two In the relays.` system here disclosedirst and second line nders, a variable lnumber of group selectors between the penultimate and nal selectors t'o.

In addition to t the two-relay.

hold the latter until the called subscriber. hangs In orderto vpermitby--passing of certain selecting stages andr re-routing calls, as. well -as for performingA other .-.operations :inl` which the ,numerical selection is diierenttftom.'ivthough,con-

trolled-by theregister, according to `another feature of the presentinvention a digit,- translator may beautomatically connected with any one of a pluralityof registers. Once its -function is performed, the translator iks-used to. control the establishment of another connection. The register and translator areiarranged :to take care of called numbers consisting Aof dilerent numbers of digits, for instance of numbers inA which-the olce prefix has two or three digitsv Any group selector may be usedior theestablishment of local orinter-oice incoming connections. Tandem trunkintgf may befpracticed from any level of any selector, and from any one of the group selectors,l or even from the nal selector, as is the casein called to a P. A. X.

The register controls the operation ofY both the numerical and the non-numericalswitches used in the establishment of a. connection. Thus the same type of. switch maybe usedeither as a line nderor as a group selector.

Other features oftheinvention haveto do with the grouping of subscribers lines and, the nonnurnerical switches, used in the. exterfison` of a call, with the selection of a Pi B. ,X trunk to `attract the attention of an attendant or'for the direct selection under the controlof the register at the main exchange .of a P. B. X subscriber, and with other features which will more clearly appear from the followingludescription of an embodiment of theinvention..

As much of a multi-cnice system will be described as is necessary `fora clear understanding of the invention.A While .a telephone system of the. so-called multi-potential selection type will be disclosed, it lwill'be clear .to those skilled in the art thatv some of'theieatures are applicable to many other types:- of switching systems, whetherthey are used forl establishing telephone connections, or ,for any. other purposes.

In theI drawings;

Fig.,1 isz a block .diagram-showing the general lay-out .of the system;

Figs. v2a vto 2ci1lus trate the various selector circuits;

Fig. 3 shows an all-purpose 4selector circuit which maybe adjustedfor-,various purposes in the marmer. indiatedfiniF-ig. 3a;

Fig. 4 shows a subscribers line circuit;

Fig.` 5,; an R- link start and Chooser circuit;

Fig. 6, .anR- linkgM Fig. 7a B-link; t

Fig. 8.,- the terminal bank of a Fig. 9, an F-link;

Figs. 10, 10a and 10b, a register;

Fig. 11, a two-digit translator; link;

Fig. 12,2'a vtwodigiti translator bank;

Fig. 13, a three-digittranslator link;

Fig. 14, a three-digit translator bank;

Fig. 15, a false call'trunk;

Fig. 16, a..loc`altri.1nk-.to anoperator;

Fig. 1'7, an out-trunkcircuit;'

Fig. 18, the tens position lof la vnal selector bank; 4

Fig. 1,9, a 1 2". B. X trunk for inrdialing to a Ilnal selector;

P. B. X; and,...

Fig. 20, a busy tone circuit. Thev following -aredeiinitions of some of the expressions use d in the specification and claims:

non-numericalY switch, such as a selector or line finder, is stopped under the control of a device, e. g. an electrical l discharge tube provided in a register controllerwhen a certain predetermined` tial `u njzler the controlof the numerical or nonnumerical switch duringtits operation.

B-link" designates aflinl exten ding between the wipers ofjaline'y nder and a first selector;

Relinkf is Va link` byhmeans of which, a register maybe associated with' aB-link; Telink is a A working or operation means .a selective operation in" which a numerical vor I holding wire and the t wire the which the establishment of calls originating Within the exchange is controlled; fT-register is a register controller by means of which'a call Which originated outside of trolled within the exchange in which the T- register is located; Final means the final selector or connector by means of which the called line is seized.

For the sake of brevity, and relay will not be repeated when reference is made to the front or back contact of a relay. Thus back BER means the back contact of relay BER..

GENERAL The selection circuit to in said patents. The finders and selectors are arranged in the manner shown on the junction diagram of Fig. 1.l

As distinguished from my Patent No. 2,380,950 where three types of switching selector circuits are used, in the present system, all switching selector circuits are identical. Each has two relays, AR and BR, as shown in Figs. 2li-2f, 3 and 3a. This circuit by simple strapping and, when necessary, by cutting in relay links may be used for the following purposes:

1st line finder, Fig. 2c

2nd line nder, Fig. 2b used with a B-link (Fig.

'7) forms the usual connection circuit 1st group selector, Fig. 2b

Local group and penultimate selectors, Fig.' ,2a

Final selector, Fig. 2d used with F-link (Fig. 9)

Incoming trunk selector, Fig. 2e

Special service group selector, Fig. 2c

` Tandem selector, Fig. 2e

The intra-cnice trunks have four Wires and the inter-office trunks two wires. The a and b wires are the talking conductors, the c wire the test wire which, during selection is used for testing but is freed after selection for miscellaneous use, such as calling line identification, multiple metering, automatic ticketing, service identification, etc. The test wire even provides the facility whereby the exchange attendant may identify the number of the calling subscriber without going to the trouble of tracing down the connection.

Register control with translation The system is register controlled. The register in the originating officethe so-called A-register--is connected to B-links (Fig. 1) through R-links. The R-links contain the equipment for handling the requirements of ringing, busy calls, metering, coin machines and other similar functions. For large areas where translation is the words contact the Vexchange is con- 4. translator links are associated with the register. Where mixed two and three-digit oflce prefixes are used, two and three-digit translators are also used. Each translator link has a register finder and translator finder. The banks ILSCESSaly,

ofthe translator finders are multipled, and one cross-connection .for each cnice prefix suces for" all translators.

The trunks incoming-from other oflices (Fig. 1) terminate in groups of relays-designated as v T-links-which are cross-connected to standard all purpose switching selector circuits. The registers Wlfiich'handle incoming calls--the socalled' T-registers-are connected to the T-links through TR-links, corresponding to the R-links usedwith the A-registers. j The possibility ofv cross-connecting and of vrusing any group selector for local or incoming connections is a great convenence in a growing and changing network.

Adding translation to unsplit selector banks such as are usedy in the present system, greatly increases the efficiency of the trunk plan in large networks. Selections may be suppressed or bypassed, for example, from the second group selectors to the penultimate selector for handling heavy local traffic. This is indicated by dotted lines in Fig. 1. Trunks may be routed in any convenient manner` and not according to a xed numerical designation as is necessary in systems without translation. Additional selections may be introduced to provide for large group concentrations for the more economical use of long and important loaded trunks, etc.

The translator controls the re-routing of calls and is automatically connected with the register depending on'the number dialed. After it had performed its function,`the translator is disconnected from the register.

Register relays' (total 37) l An explanation of the functions of the various relays will be helpful in tracing the circuits of the register. The relays may be divided into the following four groups:

(a) Register proper (18 relays, Figs. 10, 10a):

DRf-dialing relay. `Follows dial impulses.

RlR-slow release relay. Does not fall on during pulsing'.v

RZRf-slow releasing change-over relay. DoesV not fall off 'during pulses but only when the circuit is opened between the dialing of digits when DR comes to rest lon its front contact.

RAR--operatesA when the register is picked up and adaptsthe register to select the first line finder and the calling line.

RBB- operates when the calling line is picked up by the first line finder and refleases RAR. v

RCR-multi-contact relay to provide ground holding contacts.

RDR-operates when the nrst pulse is received and transfersthe grid of VIB from the calling line potential PC to the busy potential PB thus adapting the register to control the selectors.

RER-disconnects the identifying service class potential PS when dialing commences and in place thereof connects pol tential PJ to the grid of VIA.

RFR-low resistance relay in series with the a wire. Operates when the selector is hunting; 

